Compressed-air-cylinder lubricator



(No Model.)

H.- O. SERGEANT. GOMPRESSED AIR CYLINDER LUBRIGATOR.

No.- 447.910. Patented Mar. 10, 1891.

Win/Maw frown i0? UNITED STATES PATENT OFFICE.

HENRY O. SERGEANT, OF NElV YORK, N. Y., ASSIGNOR TO THE INGERSOLL- SERGEANT ROCK DRILL COMPANY, OF NEW YORK.

COMPRESSED-AlR-CYLINDER LUBRICATOR.

SPECIFICATION forming part of Letters Patent No. 447,910, dated March 10, 1891. Application filed January 10, I889. Serial No. 295,922. (No model.)

To all whom it may concern.-

Be it known that I, HENRY O. SERGEANT, of the city and county of New York, and State of New York, have invented a certain new and usefullmprovement in Compressed-Air- Oylinder Lubricators, of which the following is a specification.

My improvement relates to lubricators for compressed air cylinders, and comprises an oil-cup so constructed and arranged that oil will be fed automatically to the cylinder.

I will describe in detail a compressed-aircylinder lubricator, and then point out the novel features in the claim.

The accompanying drawing is a vertical section of a compressed-air cylinder, showing a lubricator-cup embodying my improvement, and also in section, mounted thereon.

Similar letters of reference designate corresponding parts in the figure.

G designates an air-cylinder, which may be of the usual or any desired construction.

G designates a piston working in said cylinder, and G a piston-rod connected with said piston and receiving motion from any desired source. The piston-rod may work through a suitable stufiing-box h.

A designates the oil-chamber of the lubricator, and B the discharge-neck, through which extends a discharge-passage b, and in which I have here shown a stop-valveB, which may be opened and closed through its stem This discharge-neck may be screwed into I). the cylinder G, and the shell of the stop-valve B may be constructed in one piece with the lubricator, or it may be formed separately and the lubricator provided with a shank screwing into the stop-valve shell, as shown at 12 B designates a post, which extends upward through the oil-chamber A nearly to the top thereof and is bored to form a duct 19 which communicates with the discharge-passage b. This duct b opens into the oil-chamber A near the top thereof, and in said duct is arranged a check-valve D, opening outward or in a direction to permit the passage of air or other aeriform fluid to the oil-chamber, but to prevent its return-passage. The post B with its passage b constitutes in effect a pipe. As here represented, the check-valveD is inserted in the top of the post B and I have represented the post as formed integral with the base-piece of the lubricator.

I have shown the outer wall of the oilchamber A as formed of a glass tube A, which fits a rabbet or seatain the base-piece of the lubricator anda corresponding rabbet or seat a in the cap E, which forms the top of the lubricator. As here represented, this cap consists of a skeleton-like casting having formed integral with it a nut e, screwed upon the top of the stem B By screwing up this cap the parts of the lubricator which form the oil-chamber are secured together in a liquid-tight manner. A packing of leather or other material (t may be introduced between the ends of the glass tube A and its seats a a, so as to prevent leakage.

I have shown the cap E as having inserted in it a screw-threaded plug e, which may be removed when it is desired to fill the oilchamber A, and this plug has a downward projection 6 which forms a stop to limit the opening movement of the check-valve D. A coil-spring g, interposed between the checkvalve and the projection 6 may be used to assist in returning the valve to its seat. The bottom of the oil-chan1ber A communicates through a passage a with the discharge-pas sage 1), formed in the neck of the lubricator, and the outward flow of oil through this passage a is regulated by a valve F.

It will be seen that the duct 12 admits air or other aeriform fluid above the contents of the oil-chamber A for exerting a pressure upon the top thereof.

In operation the lubricator is applied to an air-compressing cylinder at about the middle of the length of the latter, and it will of course be obvious that when the air-compressing piston reaches the middle of its stroke the air in front of the piston will have a pressure considerably greater than the atmosphere. During the first half of the stroke of the main piston the air in front of it passes upward through the discharge-passage?) and the duct into the lubricator and is discharged into the oil-chamber until the pressure within the oil-chamber nears the pressure in the compressor-cylinder at the time the main piston passes the outlet-passage b. As soon, however, as the piston passes that passage said outlet-passage b is opened to the atmospheric pressure behind the piston, and the pressure which has been admitted to the oil-chamber A above the oil therein forces the oil out through the passage a b into the compressorcylinder. The main piston in its movements maintains always a pressure of air in the oilchamber A which is equal to that in the main cylinder as the piston passes the outlet-passage b, and during considerably more than half of the stroke of the main piston oil will pass to the cylinder, and by the construction and arrangement of parts described I provide for the working of the lubricator or oil cup without any air bubbling up through the oil, while there is at the same time an intermittent flow of oil from the cup under pressure wholly from within the cup.

lVhenever it is desired to fill the oil-cup, it is only necessary to close the stop-valve B and remove the plug e. The oilcan then be poured in from an ordinary can or oiler, and as soon as the plug is reinserted the stop-valve B is opened and the lubricator will again commence to feed the cylinder with oil.

That I claim as my invention, and desire to secure by Letters Patent, is

The combination, with a compressed-air cylinder, of a piston working in said cylinder, an oil-cup in normally-open communication with the interior of said cylinder through a passage beyond which the piston will pass in both directions of its stroke, a pipe extending Vertically through said cup to near the top thereof and in open communication with said passage, and through which the air under pressure'will be forced by the piston, and a check-valve normally closing the upper end of said pipe, but intermittently opened by the air from the cylinder under pressure to admit the air above the oil in the cup, and closed by the compressed air in the oil-cup when the piston has passed by said passage in one direction, said oil-cup being provided with an outlet for oil near its lower end, admitting oil, into the interior of the cylinder, substantially as specified.

HENRY C. SERGEANT.

Witnesses:

FREDK; HAYNES, FR. BERGENGREN. 

